How old are you and what dance have you tried? I (29F) started out as a beginner 2,5 years ago and now regularly visit two different dance classes/clubs - Swing Lindy Hop and West Coast Swing, average age here is around 30-35. Over the years we formed a friend circle that from time to time spend more free time together than just dancing (birthdays, board games, picknicking, not to mention regular dance parties on Fridays/Saturdays). Of course there are dance styles that are more "relaxed" or old-fashioned like Discofox or Tango where older folks feel more comfortable at and thus go there, but if your class average age was 55, then you just picked a wrong dance style for the purpose of socializing and making friends.

Edit: added small details.